Zillion - Sega Master System
Based on the anime of the same name, Zillion is a platformer with an emphasis on exploration and problem-solving rather than on fast-paced "jump and run" gameplay. The game is set almost entirely in the underground base. Capsules containing key codes and power-ups are scattered around the vast environments. Common obstacles include enemy guards, tripwires, laser turrets, and force fields. Rooms must be unlocked by using computer ID cards and inputting the correct four-digit code. Specific actions such as turning off barriers, deactivating traps, etc., are sometimes required as well.